Sounds like they will stick to the development of further CFV solutions to me.
The rectangular backs (apart from CFV I and II) always distracted me as well. Hope they could bring something like a 4,5x4x5 sensor in the near future, though 5,5x5,5 would be the best but I don´t think that we will see that pretty soon. However, sensors are becoming cheaper every year. Mind what a 35mm full frame DSLR did cost 5 years ago and what you pay nowadays. Full frame 6x6 could come true somewhen.
I think that Hasselblad has very little chance to affect sensor designs unfortunately, at least CMOS coming out from Sony. The one that sells the most units will have the most power to affect design, and I guess that would be Pentax.
I guess CCDs have a higher degree of customization possibility (easier to make) but even then Hassy has always used standard sensors that anyone can buy. Phase One with their past higher sales volumes seems to be in a better position to get unique sensors as shown with their collaboration with Dalsa. The H4D-60 came out when Phase One's period of exclusivity of that sensor expired. I guess the IQ260 variant is a Phase One exclusive.
CCD is dead though, it just don't know it yet. CMOS is the future, and with that I think the flexibility of small or large customizations will be greatly reduced as CMOS needs more volume, ie work for many manufacturers, to work business-wise. Hopefully I'm wrong though, maybe it's easy to make a custom size?
I've heard that Hassy is/was interested in getting a 49x37mm CMOS from Sony as some optics in the H system is optimized for that format but they wouldn't listen. On the other hand this is only the first CMOS sensor for MF, and then 44x33mm was surely the safest bet to test the market.